LDC3114 Series

4-channel inductance-to-digital converter for low-power proximity and touch-button sensing

Catalog

4-channel inductance-to-digital converter for low-power proximity and touch-button sensing

Part	Type	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Max]	Voltage - Supply [Min]	Voltage - Supply [Min]	Mounting Type	Voltage Supply Source	Number of Channels	Operating Temperature [Max]	Operating Temperature [Min]	Data Interface	Package / Case [x]	Package / Case	Package / Case [y]
Texas Instruments LDC3114QPWR	Touch and Inductance	16-TSSOP	1.89 V	1.89 V	1.71 V	1.71 V	Surface Mount	Single Supply	4	125 °C	-40 °C	I2C	0.173 in	16-TSSOP	4.4 mm

Catalog

4-channel inductance-to-digital converter for low-power proximity and touch-button sensing

Key Features

• Multiple modes of operation:Raw data mode: access pre-processed inductance measurement data to enable advanced algorithms on MCU for linear sensingButton mode: button press detection with baseline tracking and advanced on-chip post processingForce level measurement of touch buttonsPin and register compatible toLDC2114Robust EMI performance allows for CISPR 22 and CISPR 24 complianceFour independent channel operationConfigurable scan rates:0.625 SPS to 160 SPSContinuous scanning optionAdvanced button press detection algorithms:Adjustable force threshold per buttonEnvironmental shift compensationSimultaneous button press detectionLow current consumption:One button: 6 µA at 0.625 SPSTwo buttons: 72 µA at 20 SPSTemperature rangeTSSOP (16) : –40°C to +125°CInterface:1.8-V and 3.3-V compliant I2C and INTB1.8-V logic output per channel for buttonsMultiple modes of operation:Raw data mode: access pre-processed inductance measurement data to enable advanced algorithms on MCU for linear sensingButton mode: button press detection with baseline tracking and advanced on-chip post processingForce level measurement of touch buttonsPin and register compatible toLDC2114Robust EMI performance allows for CISPR 22 and CISPR 24 complianceFour independent channel operationConfigurable scan rates:0.625 SPS to 160 SPSContinuous scanning optionAdvanced button press detection algorithms:Adjustable force threshold per buttonEnvironmental shift compensationSimultaneous button press detectionLow current consumption:One button: 6 µA at 0.625 SPSTwo buttons: 72 µA at 20 SPSTemperature rangeTSSOP (16) : –40°C to +125°CInterface:1.8-V and 3.3-V compliant I2C and INTB1.8-V logic output per channel for buttons

Description

The LDC3114 is an inductive sensing device that enables touch button design for human machine interface (HMI) on a wide variety of materials by measuring small deflections of conductive targets using a coil that can be implemented on a small printed circuit board (PCB) located behind the panel. This technology can be used for precise linear position sensing of metal targets for automotive, consumer and industrial applications by allowing access to the raw data representing the inductance value. Inductive sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt. The button mode of LDC3114 is able to automatically correct for any deformation in the conductive targets. The LDC3114 offers well-matched channels, which allow for differential and ratiometric measurements which enable compensation of environmental and aging conditions such as temperature and mechanical drift. The LDC3114 includes an ultra-low power mode intended for power on/off buttons or position sensors in battery powered applications. The LDC3114 is easily configured through an I2C interface. The LDC3114 is available in a 16-pin TSSOP package. The LDC3114 is an inductive sensing device that enables touch button design for human machine interface (HMI) on a wide variety of materials by measuring small deflections of conductive targets using a coil that can be implemented on a small printed circuit board (PCB) located behind the panel. This technology can be used for precise linear position sensing of metal targets for automotive, consumer and industrial applications by allowing access to the raw data representing the inductance value. Inductive sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt. The button mode of LDC3114 is able to automatically correct for any deformation in the conductive targets. The LDC3114 offers well-matched channels, which allow for differential and ratiometric measurements which enable compensation of environmental and aging conditions such as temperature and mechanical drift. The LDC3114 includes an ultra-low power mode intended for power on/off buttons or position sensors in battery powered applications. The LDC3114 is easily configured through an I2C interface. The LDC3114 is available in a 16-pin TSSOP package.